Journal
PHYSICAL REVIEW A
Volume 104, Issue 1, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.104.013510
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Funding
- Agence Nationale de la Recherche [ANR-19CE30-0028-01 CONFOCAL]
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The study investigates the coupling phenomenon between the motional and the polarization degrees of freedom in nonparaxial polarized light beams propagating in a bulk nonlinear Kerr medium, realizing a spin-orbit-coupled mixture of fluids of light. An anisotropic Bogoliubov spectrum with both low-frequency gapless branches and high-frequency gapped ones is discovered. Experimental protocols are proposed to study the excitation mechanisms of these modes, highlighting a phenomenon of hybridization between density and spin modes unique to spin-orbit coupling.
We show that nonparaxial polarized light beams propagating in a bulk nonlinear Kerr medium naturally exhibit a coupling between the motional and the polarization degrees of freedom, realizing a spin-orbit-coupled mixture of fluids of light. We investigate the impact of this mechanism on the Bogoliubov modes of the fluid, using a suitable density-phase formalism built upon a linearization of the exact Helmholtz equation. The Bogoliubov spectrum is found to be anisotropic, and features both low-frequency gapless branches and high-frequency gapped ones. We compute the amplitudes of these modes and propose a couple of experimental protocols to study their excitation mechanisms. This allows us to highlight a phenomenon of hybridization between density and spin modes, which is absent in the paraxial description and represents a typical fingerprint of spin-orbit coupling.
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